Here are pictures of the Titanic, Fairmount Sherpa, and Pride of Rotterdam in real life, along with some other SS08 vessels in real life:
Agile Solution made from Deo Volente:
Real Life Arie Visser:
Jumbo Javelin Real life:
Most vessels, including Fairmount Sherpa, are real and others are based off real vessels, like Ocean Star to Carnival Legend.